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Old 12-25-2016, 12:18 PM
GO_FOR_JOE GO_FOR_JOE is offline
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New to me Celestron telescope

Hello and merry christmas everyone. This Christmas, I was gifted my fathers old Celestron Star Hopper 8", for the most part it looks to be in good condition, it has a 25" and 6" eyepiece, looking into it, I see cobwebs and dust, how should I go about cleaning it up. I am new to astronomy so please forgive my ignorence
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Old 12-25-2016, 12:19 PM
Chronos Chronos is offline
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Compressed air is your best bet for cleaning it.
  #3  
Old 12-25-2016, 12:34 PM
beowulff beowulff is online now
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Quote:
Originally Posted by Chronos View Post
Compressed air is your best bet for cleaning it.
Yes.

DO NOT TAKE IT APART!

Better to have it dusty than mis-aligned. Once you learn about it, taking the main mirror out and cleaning it is possible, but then requires a lot of careful re-alignment.
  #4  
Old 12-25-2016, 01:07 PM
DSYoungEsq DSYoungEsq is offline
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This assumes it's properly aligned to begin with. Given the age of the instrument, and length of disuse, that might be a poor assumption.
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Old 12-25-2016, 01:13 PM
wolfpup wolfpup is online now
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Concur with the use of compressed air only. Be especially carefully with the mirror as telescope mirrors are front surface coated and will scratch with even the slightest abrasion.

BTW, your eyepieces are not 25" and 6", they are 25mm and 6mm. I believe the 8" Celestron Dob has a focal length of about 1220mm, so your 25mm eyepiece will give you a wide field of view with around 50x magnification, and the 6mm gives you about 200x magnification.
  #6  
Old 12-25-2016, 01:20 PM
watchwolf49 watchwolf49 is offline
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Congratulations ... that's a fine telescope you have there ... as Chronos suggests just carefully blow the detritus out with compressed air ... then go out and use it ... even a little dirty this piece should give you a wonderful start to telescoping pleasures ... I've many many fond memories of standing at the eyepiece in the middle of bitterly cold nights ...

If you find that you enjoy the hobby ... and wish to pursue it ... then try to find someone with experience cleaning telescopes and have them do a thorough cleaning ... then have them re-align it for you ... they may be far and few between but the local university or local astronomy club would be the place to ask ...

Start with Venus in the evening sky ... you'll get a taste of what Galileo felt the first time he saw it ... Saturn is currently to close to the sun to see ... but in a few months you'll be able to catch it ...

ETA: When you outgrow your papa's old telescope, here's a 48" Newtonian for sale ... no price ... gotta be less than 8 digits though

Last edited by watchwolf49; 12-25-2016 at 01:24 PM.
  #7  
Old 12-25-2016, 01:26 PM
Quartz Quartz is offline
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Originally Posted by watchwolf49 View Post
Saturn is currently to close to the sun to see ... but in a few months you'll be able to catch it ...
NEVER look at the sun through it without a solar filter.
  #8  
Old 12-25-2016, 01:30 PM
watchwolf49 watchwolf49 is offline
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Originally Posted by Quartz View Post
NEVER look at the sun through it without a solar filter.
Also ... at night ... if you take a break turn the tube to the horizontal ... this keeps dew from condensing on the correction plate and/or mirror ... NEVER NEVER try to wipe the mirror for any reason ... that's really really bad

Last edited by watchwolf49; 12-25-2016 at 01:31 PM.
  #9  
Old 12-25-2016, 02:54 PM
dtilque dtilque is offline
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If, after you've cleaned it and used it for a while, you may think it's not giving the best performance. It may be in need of collimation. Here's a good place to start: A Beginner’s Guide to Collimation

Last edited by dtilque; 12-25-2016 at 02:54 PM.
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